1. Electrophysiology Unit, Cardiovascular Division, Department of Medicine Hospital del Mar, Universitat Autònoma de Barcelona Barcelona Spain
2. Electrophysiology Unit, Cardiology Department Hospital Vall d'Hebron Barcelona Spain
3. Arrhythmia Unit, Cardiology Department Complejo Hospitalario de Navarra Navarra Spain
4. Arrhythmia Unit, Cardiology Department Hospital Joan XXIII Tarragona Spain
5. Electrophysiology Unit Hospital del Mar Barcelona Spain
6. Electrophysiology Unit, Cardiology Department Hospital Universitari Germans Trias i Pujol Badalona Spain